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03508 CARBURIZATION RESISTANCE OF DEVELOPMENTAL HEAT RESISTING ALLOYS

Picture for 03508 CARBURIZATION RESISTANCE OF DEVELOPMENTAL
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Product Number: 51300-03508-SG
ISBN: 03508 2003 CP
Author: P. Becker, D.J. Young
Industry: Materials Selection and Design
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The carburization resistance of a range of heat resisting alloys, including a new grade, has been investigated. Attention was focussed on the effects of aluminium and reactive element additions on the performance of Fe-19Cr-45Ni-3Mo (all compositions in weight percent). The alloys were exposed isothermally at temperatures of 900-1100C to flowing gas mixtures of hydrogen – 5 volume percent methane. Internal precipitation of chromium-rich carbides, M7C3 and M23C6, was the main corrosion process for all alloys. Parabolic kinetics were observed, and comparison of the rate constants with those predicted from Wagner’s diffusion theory was used to identify the benefits of the minor alloy additions. The alloys were also subjected to carburising – oxidising conditions, using a gas composition H2- 4.7CH4-6H2O volume percent, producing an oxygen potential high enough to react chromium and aluminium, but not iron or nickel. To make conditions more severe, temperature cycling was employed: 45 min at reaction temperature and 15 min at room temperature, repeated 500 times. At 1000C, all alloys behaved protectively, growing spallation-resistant oxide scales which prevented carbon entering the metal. At 1100C, the alloys initially behaved in the same way, but spallation commenced after 200 cycles. Although this led to net weight losses, the alloys retained the ability to reform protective oxide scales for at least 500 cycles, thereby achieving protection against carburization. Keywords: High temperature, internal precipitation, carburisation, oxidation
The carburization resistance of a range of heat resisting alloys, including a new grade, has been investigated. Attention was focussed on the effects of aluminium and reactive element additions on the performance of Fe-19Cr-45Ni-3Mo (all compositions in weight percent). The alloys were exposed isothermally at temperatures of 900-1100C to flowing gas mixtures of hydrogen – 5 volume percent methane. Internal precipitation of chromium-rich carbides, M7C3 and M23C6, was the main corrosion process for all alloys. Parabolic kinetics were observed, and comparison of the rate constants with those predicted from Wagner’s diffusion theory was used to identify the benefits of the minor alloy additions. The alloys were also subjected to carburising – oxidising conditions, using a gas composition H2- 4.7CH4-6H2O volume percent, producing an oxygen potential high enough to react chromium and aluminium, but not iron or nickel. To make conditions more severe, temperature cycling was employed: 45 min at reaction temperature and 15 min at room temperature, repeated 500 times. At 1000C, all alloys behaved protectively, growing spallation-resistant oxide scales which prevented carbon entering the metal. At 1100C, the alloys initially behaved in the same way, but spallation commenced after 200 cycles. Although this led to net weight losses, the alloys retained the ability to reform protective oxide scales for at least 500 cycles, thereby achieving protection against carburization. Keywords: High temperature, internal precipitation, carburisation, oxidation
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02386 A NEW CARBURIZATION RESISTANT ALLOY FOR ETHYLENE PYROLYSIS FURNACE TUBES

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ISBN: 02386 2002 CP
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Publication Date: 2002
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A new wrought alloy has been developed for use as furnace tubes in ethylene pyrolysis plants. This alloy has an excellent carburization resistance due to uniform formation of protective Al2O3 oxide scale on the metal surface. Laboratory corrosion tests have been carried out to evaluate carburization resistance of the developed alloy.
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03474 Alloy Carburization at Temperatures of 1,200 - 2,100°F (650 - 1,150°C)

Product Number: 51300-03474-SG
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